Louder than a club and packed tighter. Whatever forms here forms at touching distance.
Four numbers decide what a crowd does: how tightly it is packed, how loud it is, how fast alcohol arrives, and how much attention is available for the people beside you. Everything below is either a published figure or derived from one.
A warehouse takes the nightclub formula and pushes both dials. Density rises to 2.6 people per square metre and the sound level to about 106 dB, which drops the speech range to 55 centimetres — the shortest of any room on this site, shorter even than front of stage.
It produces the highest raw encounter rate modelled: 17.9 per person per hour. That is not despite the collapsed speech range but partly because of it — the room is so packed that the number of people inside even a 55 centimetre radius stays high, and everyone is standing still rather than moving through.
The yield tells a different story. Those encounters convert to 599 lasting ties, marginally more than a nightclub and well behind a beer tent that generates fewer encounters in a far quieter room. Volume of contact and quality of contact are close to independent, and this room is the clearest demonstration.
Measured output from a standard run: 1,200 people, 4 hours of venue time, fixed seed, no parameter overrides. Every room on this site is run under identical conditions, so these figures are a like-for-like comparison rather than a set of individually flattering runs.
The crowd is a simulation and is presented as one. What is not invented are its constants: walking speed against density, the proxemic zones, the collapse of speech range with noise, the Widmark blood-alcohol curve and the conversational group limit all come from published work, cited above and listed in full in the engine.
Every gathering below is modelled as this kind of room. Attendance figures are published numbers for the period stated.
Around 106 dB(A), above typical club levels of 95–110 dB and enough to reduce the intelligible speech range to roughly 55 cm.
It produces slightly more encounters per person per hour, because it is packed tighter and nobody is in transit. Lasting ties are close to identical, so the extra contact largely does not convert.
The intelligible distance collapses roughly exponentially with sound level. Raising your voice — the Lombard effect, about 0.5 dB gained per dB of noise — recovers only part of it.
Each person is one cell with a position, a body mass, a Widmark distribution ratio, an openness trait and a reserve of energy. They walk at the speed the local density allows, drink at the rate the room serves, and when two of them stay within speech range long enough, a bond forms. Most bonds are nothing.
What separates an encounter that creates something from one that does not is whether it bridges two groups that were not previously connected. A tie inside an existing group mostly restates what that group already knows; a tie across a gap carries information neither side had. That distinction is Granovetter's, and it is the mechanic the whole model turns on.
One parameter has no citation and should be read as an assumption: attention, the share of a person available to whoever is beside them rather than to a stage, a road or a rite. It is the variable that separates a street crossing from a dancefloor at similar density, and it is the one this model asserts rather than borrows.
